Namibia is about 1.8 times smaller than Alaska.

Alaska is approximately 1,481,348 sq km, while Namibia is approximately 824,292 sq km, making Namibia 55.64% the size of Alaska. Meanwhile, the population of Alaska is ~710,231 people (2.0 million more people live in Namibia).
Tip: This to-scale comparison of Alaska vs. Namibia uses the Mercator projection, which distorts the size of regions near the poles.